On Sun, 01 Nov 2020 11:27:49 +0000 (GMT), Dave Plowman (News) wrote:

Have a two gang RCD protected metal clad socket in the conservatory
which has failed - RCD will no longer latch on.

I'll ask the stupid questions:

Won't latch on with nothing plugged in?
Checked nothing untoward in the wiring?
It has got power? Some RCDs won't latch without power and unlatch
when power is lost (maybe a fail safe feature of plugin units only
though).

--
Cheers
Dave.